<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      .box {
        width: 92vw;
        height: 40vw;
        margin: 4vw;
        background-color: skyblue;
      }
    </style>
  </head>
  <body>
    <div class="box"></div>
  </body>
</html>
